Gamma GM7230-5.0TA5T 3a step-down voltage regulator Datasheet

A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
Features
Description
3.3V, 5V, 12V and Adjustable output versions
GM7230 of regulators provides all the active functions for a
step-down (buck) switching regulator, and drives 3A load
with excellent line and load regulation. GM7230's is available in fixed output voltages of 3.3V, 5V, 12V, and a versatile Adjustable output version.
Adjustable version output voltage range 1.23V
to 37V
4% max over line and load conditions
3A output current
Input voltage range up to 40V
These regulators are simple to use and require a minimum
number of external components. Features include internal
frequency compensation and a fixed-frequency oscillator.
The GM7230 is high-efficiency replacements for popular
three-terminal linear regulators, and is requiring a smaller
heatsink or even no heatsink.
Requires only 4 external components
High efficiency
TTL shutdown capability, low power standby
mode
GM7230 performs well with standard inductors from several manufacturers, and simplifying the design of switchmode power supplies. GM7230 guarantees ±4% tolerance
on output voltage within specified input voltages and output load conditions, and ±15% on the oscillator frequency.
Low power standby mode, IQ typically 80 UA
Thermal shutdown, current limit protection
Uses standard inductors
150 kHz fixed frequency internal oscillator
External shutdown is included with 80 µA (typical) standby
current. The output switch has cycle-by-cycle current limiting as well as thermal shutdown for full protection under
fault conditions.
GM7230 operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be
needed with lower frequency switching regulators. Available in a
standard 5-lead TO-220 package with several different
lead bend options, and a 5-lead TO-263 surface mount
package.
Application
Pre-regulator for linear regulators
On-card/board switching regulators
High-efficiency step-down buck regulator
Positive to negative converter (buck-boost)
12V
Unregulated
DC Input
+VIN
1
+ C
IN
GM7230
5.0
5
680 µF
ON / OFF
Feedback
4
Output
2
3
GND
L1
68 µH
D1
1N5824
+
COUT
220 µF
5.0V
Regulated
Output
3A Load
www.gammamicro.com
GM7230 V0.11
TYPICAL APPLICATIONS
1
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
MARKING INFORMATION & PIN CONFIGURATIONS
TO-220- 5B
TO-220- 5
.
.
.
VIN
Output
Ground
2
TO-263-5(D PAK)
GM7230
GM7230
VVAYWW
VVAYWW
VIN
Output
Ground
ON/OFF
Feedback
GM7230
VVAYWW
ON/OFF
Feedback
1 2 3 4 5
VIN
Output
Ground
V V / VVV= Output Voltage
(33=3.3V , 12=12V, A=Adj)
A
= Assembly Location
Y
= Year
WW
= Weekly
ORDERING INFORMATION
GM7230
Ordering Number
2
Output Voltage
Package
GM7230-ATB5T
Adj
TO-220-5
50 Units / Tube
GM7230-ATB5BT
Adj
TO-220-5B
50 Units / Tube
GM7230-ATA5R
Adj
TO-263-5
800 Units/ Tape & Reel
GM7230-ATA5T
Adj
TO-263-5
50 Units / Tube
GM7230-3.3TB5T
3.3
TO-220-5
GM7230-3.3TB5BT
3.3
TO-220-5B
GM7230-3.3TA5R
3.3
TO-263-5
800 Units/ Tape & Reel
GM7230-3.3TA5T
3.3
TO-263-5
50 Units / Tube
GM7230-5.0TB5T
5.0
TO-220-5
50 Units / Tube
GM7230-5.0TB5BT
5.0
TO-220-5B
50 Units / Tube
GM7230-5.0TA5R
5.0
TO-263-5
GM7230-5.0TA5T
5.0
TO-263-5
GM7230-12TB5T
12
TO-220-5
GM7230-12TB5BT
12
TO-220-5B
Shipping
50 Units / Tube
50 Units / Tube
800 Units/ Tape & Reel
50 Units / Tube
50 Units / Tube
50 Units / Tube
GM7230-12TA5R
12
TO-263-5
800 Units/ Tape & Reel
GM7230-12TA5T
12
TO-263-5
50 Units / Tube
GM7230-15TB5T
15
TO-220-5
GM7230-15TB5BT
15
TO-220-5B
GM7230-15TA5R
15
TO-263-5
800 Units/ Tape & Reel
GM7230-15TA5T
15
TO-263-5
50 Units / Tube
* TB5B: Bent and Staggered Leads of TO-220 package
** For detail Ordering Number identification, please see last page.
ON/OFF
Feedback
50 Units / Tube
50 Units / Tube
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
ABSOLUTE MAXIMUM RATINGS
Rating
Maximum Supply Voltage
ON/OFF Pin Input Voltage/ Feed back pin voltage
-0.3
Output Voltage to Ground (Steady State)
Power Dissipation
Value
Unit
45
V
V
V
+25
-1.0
V
Internally Limited
-
-65 to + 150
°C
+150
°C
Storage Temperature Range
Maximum Junction Temperature
-40
Operating Temperature Range
TJ
Minimum ESD Rating (C=100pF, R=1.5kW)
125
°C
2
kV
Lead Temperature (Soldering, 10 sec.)
+260
°C
Lead Temperature
S Package
Vapor Phase (60 secretary.)
Infrared (10 secretary.)
T Package (Soldering, 10 secretary.)
Maximum Junction Temperature
+215
+245
+260
+150
°C
OPERATING CONDITIONS
Rating
Unit
Value
Temperature Range
45
Supply Voltage
TJ
°C
+125
V
4.5 to 40
BLOCK DIAGRAM
ON/ OFF
1.235V
Reference
2.5V
Regulator
+
COMP
Current
Limit
COMP
+
2.5V
FEEDBACK
R2
R1=
2.5K
GM
+
AMP
Active Capacitor
3.3V,R2=4.2K
5V,R2=7.6K
12V,R2=21.8K
ADJ,R2=0W
R1=OPEN
+
OP AMP
-
COMP
+
+
Start Up
Latch
FREQ SHIFT
150kHz
OSC
VIN
+
220 220
mV mV
3A
Switch
Driver
Reset
Thermal
Limit
OUTPUT
GND
GM7230
Current
Source
Bias
3
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS: GM7230-3.3
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Conditions
Parameter
Output Voltage
4.75
VIN 40V, 0.2A ILOAD 3A
VIN = 12V, ILOAD = 3.0A
Efficiency
Symbol
Min
Typ
Max
Unit
VOUT
3.168/3.135
3.3
3.432/3.465
V
h
-
73
-
%
ELECTRICAL CHARACTERISTICS: GM7230-5.0
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Conditions
Parameter
Output Voltage
7V
VIN
40V, 0.2A ILOAD 3A
VIN = 12V, ILOAD = 3.0A
Efficiency
Symbol
Min
Typ
Max
Unit
VOUT
4.800/4.750
5.0
5.200/5.250
V
h
-
80
-
%
ELECTRICAL CHARACTERISTICS: GM7230-12
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Conditions
Parameter
Output Voltage
15V
VIN
40V, 0.2A ILOAD 3A
VIN = 25V, ILOAD = 3.0A
Efficiency
Symbol
Min
Typ
Max
Unit
VOUT
11.52/11.40
12.0
12.48/12.60
V
h
-
90
-
%
ELECTRICAL CHARACTERISTICS: GM7230-ADJ
(Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range)
Conditions
Parameter
Feedback Voltage
GM7230
Efficiency
4
4.5V
VIN
40V, 0.2A ILOAD 3A
VOUT = 3V
VIN = 12V, ILOAD = 3A, VOUT=3V
Symbol
Min
Typ
Max
Unit
VOUT
1.193/1.180
1.230
1.267/1.280
V
h
-
73
-
%
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(Specifications with standard type face are for TJ = 25 C, and those with boldface type apply over full Operating Temperature Range.
Unless otherwise specified, VIN= 12V for the 3.3V, 5.0V and ADJ version and VIN= 24V for 12V version. ILOAD = 500 mA)
Conditions
Symbol
Min
Typ
Max
Unit
VFB = 1.3V (Adjustable Version Only)
Ib
-
10
50 / 100
nA
(Note 6)
fo
127/110
150
173 / 173
kHz
IOUT = 3A (Notes 7, 8)
VSAT
-
1.16
1.4 / 1.5
V
Max Duty Cycle (ON)
(Note 8)
DC
100
-
%
Min Duty Cycle (OFF)
(Note 9)
DC
0
-
%
Peak Current (Notes 7, 8)
ICL
4.5
6.9 / 7.5
A
-
-
50
µA
-
2
30
mA
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Current Limit
(Notes 7, 9, 10)
Output = 0 V
(Notes 10)
Output = -0.9V
Output Leakage Current
Quiescent Current
Standby Quiescent Current
(Note 9)
IQ
-
5
10
mA
ON/OFF Pin = 5V (OFF) (Note 10)
ISTBY
-
80
200 / 250
µA
-
2
50
50
30
20
-
°C/W
TO-263 Package, Junction to Ambient (Note 14)
qJC
qJA
qJA
qJA
qJA
Low (ON)
VIH
-
1.3
0.6
V
High (OFF)
VIL
2.0
1.3
-
V
VLOGIC = 2.5V (OFF)
IH
-
5
15
µA
VLOGIC = 0.5V (ON)
IL
-
0.02
5
µA
TO-220 or TO-263 Package, Junction to Case
TO-220 Package, Junction to Ambient (Note 11)
Thermal Resistance
TO-263 Package, Junction to Ambient (Note 12)
TO-263 Package, Junction to Ambient (Note 13)
ON/OFF Pin
Logic Input Level
IL
3.6 / 3.4
ON/OFF Pin Input Current
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 3: Typical numbers are at 25°C and represent the most likely norm.
Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are
100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator
system performance. When the GM7230 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section
of Electrical Characteristics.
Note 6: The switching frequency is reduced when the second stage current limit is activated.
Note 7: No diode, inductor or capacitor connected to output pin.
Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor
switch OFF.
Note 10: VIN = 40V.
Note 11: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a printed circuit board
2
with (1 oz.) copper area of approximately 1 in .
Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in2 of (1 oz.) copper area.
2
Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in of (1 oz.) copper area.
2
Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in of (1 oz.) copper area on
2
GM7230
Gm7230 side of the board, and approximately 16 in of copper on the other side of the p-c board.
5
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
TEST CIRCUIT AND LAYOUT GUIDELINES
Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring
inductance generate voltage transients which can cause problems. To minimize inductance and ground loops,
the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Singlepoint grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When
using the Adjustable version, place the programming resistors as close as possible to Gm7230, to keep the
sensitive feedback wiring short.
Figure 1(a). Fixed Output Voltage Versions
GM 7230-
+VIN
1
FIXED OUTPUT
Feedback
4
L1
Output
VOUT
2
GND 3
VIN
Unregulated
DC Input
ON/OFF 5
+
+
CIN
D1
COUT
I
Current
meter
K1
CIN - 470 µF, 50V, Aluminum Electrolytic
COUT - 220 µF, 25V, Aluminum Electrolytic
D1 - 5A, 40V Schottky
GM7230
L1 - 68 µH, 3L Electronic Corp. TC-680M-3A-5026
6
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
Power Management
Figure 1(b). Adjustable Output Voltage Versions
Feedback
+VIN
4
GM 7230-ADJ
1
L1
Output
VOUT=5.0V
2
GND 3
ON/ OFF 5
+
+
CIN
D1
R2
COUT
R1
VOUT = VREF ( 1 +
L
O
A
D
R2
)
R1
VOUT
R2 = R1 ( V
-1)
REF
where VREF = 1.23V, R1 aproximetly 1kW, 1%
CIN - 470 µF, 50V, Aluminum Electrolytic
COUT - 220 µF, 25V, Aluminum Electrolytic
D1 - 5A, 40V Schottky
L1 - 68 µH, 3L Electronic Corp. TC-680M-3A-5026
R1 - 1k , 1%
VOUT = 5V, R2 = 3.06k , 1%
GM7230
Unregulated
DC Input
7
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
Typical Performance Characteristics
Figure 3. Switch Current Limit
Figure 2. Switch Saturation Voltage
1.4
5.5
VIN = 12V
SWITCH CURRENT LIMIT (A)
SATURATION VOLTAGE (V)
1.3
1.2
1.1
TJ = - 40°C
1.0
0.9
0.8
25°C
125 °C
VIN = 12V
VOUT = 5V
5.0
4.5
4.0
0.7
3.5
-50
0.6
0
1
2
3
4
SWITCH CURRENT (A)
50
75
100
125
Figure 5. Operating Quiescent Current
SWITCH CURRENT (mA)
INPUT-OUTPUT DIFFERENTIAL (V)
1.2
25
24
L = 33 µH
RIND = 0.04W
VOUT = VREG -50mV
1.4
0
JUNCTION TEMPERATURE (°C)
Figure 4. Dropout Voltage
1.6
-25
ILOAD = 3A
1.0
ILOAD = 1A
0.8
4.5V < VIN < 40V
SWITCH = 0
20
16
Switch ON
12
8
Switch OFF
4
0.6
-50
-25
0
25
50
75
100
0
-50
125
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 6. Shutdown Quiescent Current
Figure 7. Minimum Operating Supply Voltage
120
5
VON / OFF = 5V
100
SUPPLY VOLTAGE (V)
CURRENT (µA)
TJ = 25°C
80
TJ = -40°C AND 125°C
60
40
20
0
GM7230
0
8
10
20
30
SUPPLY VOLTAGE (V)
40
4
3
2
1
0
-50
VOUT = 1.23V
ILOAD = 120 mA
-25
0
25 50
75 100 125
JUNCTION TEMPERATURE (°C)
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
Typical Performance Characteristics
Figure 8. ON / OFF Pin Current (Sinking)
160
8
7
-40°C
VIN = 40V
TJ 125°C
155
FREQUENCY (kHz)
6
5
4
3
150
145
140
2
135
1
0
0
5
10
15
20
ON / OFF PIN VOLTAGE (V)
25
130
-50
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE (°C)
GM7230
CURRENT(µA)
Figure 9. Switching Frequency
9
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
Inductor Selection by Manufacturer's Part Numbe.
Inductor Value
3L Electronic Corp.
47µH
TC-470M-3A-5026
68µH
TC-680M-3A-5026
100µH
TC-101M-3A-5026
150µH
TC-151M-3A-8026
220µH
TC-221M-3A-8026
330µH
TC-331M-3A-8026
470µH
TC-471M-3A-8026
680µH
TC-681M-3A-8026
1000µH
TC-102M-3A-9426
1500µH
TC-152M-3A-9426
3L Electronic Corp., + 886(2) 86659999
Website : www.3lcoil.com.tw
Capacitor Selection by Manufacturer's Part Number
Capacitor Value
Nippon ChemiI - Con Corp.
100µF
KY50VB100-MH11
220µF
KY50VB220-MJ16
470µF
680µF
KY50VB470-MJ30
KY50VB680-MK30
1000µF
KY50VB1000-ML25
GM7230
Nippon Chemi-Con Corp. , + 81(3)54367628
Website : www.chemi-con.co.jp
10
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
TO-220-5 PACKAGE OUTLINE DIMENSIONS
9.97 ± 0.20
4.50 ± 0.20
9.90 ± 0.20
3.60 ± 0.20
8.0 ± 0.20
8.70
2.80 ± 0.10
7.0
+0.1
1.30 -0.05
4.60
8.40
15.90 ± 0.20
3.70 ± 0.20
1.2
3°
7.0 ± 0.20
28.78 MAX
1.50 DP0.20
9.20 ± 0.20
1.30 ± 0.10
1.70
9.20 ± 0.20
3°
3°
13.08 ± 0.20
3-R0.2
5-0.8 ± 0.10
+0.1
0.50 -0.05
2.40 ± 0.20
1.7(TYP)
3°
3°
2 - R 0.3
Unit: mm
10.00 ± 0.20
TO-263-5 PACKAGE OUTLINE DIMENSIONS
9.90
4.50
1.30
15°
0.40
1.20
3°
4.60
1.50 DP0.20
9.20
Pad Layout
0.10
15.3
3°
2.00
1.20
4.90
17.5
9
2.40
R0.30
0.75
R0.30
1.7
0.80
0.40
11.5
0.50
1.70 TYP
(1.70 ± 0.20)
3.8
2.54
10.0
8.0
7.0
4.40
1.07
3°
R 0.3
0.90
R 0.45
7.2
Units: mm
9.20
15.30
10.00
4.90
Unit: mm
GM7230
1.75
3°
11
A
Power Management
GM7230
A
MICROELECTRONICS
3A STEP-DOWN VOLTAGE REGULATOR
TO-220-5B PACKAGE OUTLINE DIMENSIONS
0.18 ± 0.004
4.57 ± 0.1
0.4 ± 0.006
10.16 ± 0.15
0.108 ± 0.006
2.74 ± 0.15
0.05 ± 0.004
1.27 ± 0.1
0.151 ± 0.002
3.84 ± 0.05
0.05 ± 0.004
1.27 ± 0.1
0.4985 ± 0.0075
12.66 ± 0.2
0.032 ± 0.004
0.81 ± 0.1
0.358 ± 0.008
9.1± 0.2
0.9645 ± 0.0075
24.5 ± 0.2
0.996 ± 0.008
25.3± 0.2
0.138 ± 0.004
3.5 ± 0.1
0.105 ± 0.006
2.76± 0.15
0.1535 ± 0.0035
3.9 ± 0.1
0.213 ± 0.004
5.4 ± 0.1
0.220 TYP
1.700 TYP
0.268 ± 0.004
0.68 ± 0.1
0.173 ± 0.006
4.4 ± 0.15
0.331 ± 0.006
8.4 ± 0.15
0.0165 ± 0.0045
0.42 ± 0.11
(
Inches
)
mm
ORDERING NUMBER
GM 7230 A TB5 T
Shipping
R: Tape & Reel
T: Tube
Gamma Micro.
GM7230
Circuit Type
12
Package
TA5: TO-263-5
TB5: TO-220-5
TB5B: TO-220-5B
Output Voltage
A: Adj, 3.3: 3.3V
5.0: 5.0V, 12: 12V
15: 15V
A
3A STEP-DOWN VOLTAGE REGULATOR
GM7230
A
MICROELECTRONICS
Power Management
GM7230
13
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